SATRACK is a missile guidance system evaluation methodology that uses GPS signals to track satellites and evaluate error and accuracy for ballistic missile guidance systems. The major modules of SATRACK are the GPS translator, telemetry ground station, and post flight processing. It provides precise error measurements and accuracy assessments that were previously difficult to obtain. SATRACK continues to support strategic weapons system operations and evolution.

1. SATRACK - Missile Guidance System
By
Nitisha S
08JG1A0468
ECE

2. Introduction
• SATRACK is the acronym for SATellite
SAT
missile TRACKing system
• SATRACK is an evaluation methodology
developed for the guidance system of the
ballistic missiles.
• It is used for error evaluation and missile
accuracy

3. Need for SATRACK
• Early guidance systems were based on the
radars which is now replaced by GPS.
• Precise error measurements and accuracy
were the main contributions made by the
GPS SATRACK.
• It has an extensive Post Flight Processing
capability

4. MODULES of SATRACK
The major modules of SATRACK system
are:
• GPS Translator
•Telemetry Ground station
•Post Flight Processing

5. Overview of SATRACK
System

6. GPS Positioning
GPS Constellation
Trilateration

7. GPS SIGNALS
• Satellite signals are transmitted at
two frequencies:
L1 -1575.42MHz
L2 -1227.60MHz
• The use of two signals is to allow
refraction errors through the
ionosphere.
• Modulation Techniques used is
BPSK
• Two types of modulation codes
are used:
- P-code
- C/A code

8. Hardware used in Translator
and ground station

9. POST FLIGHT TRACKING AND
DATA PROCESSING

10. Conclusion
SATRACK is a noteworthy contributor to the
successful development and operational success
of the trident weapons system. It provides a unique
monitoring function that is critical to the
maintenance of strategic weapons systems.
SATRACK will continue to support the Navy’s
strategic weapon system operations and evolution
for the foreseeable future.

11. References
• T.Thompson, L.J.Levy, and E.Westerfield,” The SATRACK
system: Development and applications,” Johns Hopkins APL
Tech Digest Vol.19 No.4 pp 436-446 1998
• Miniature Analog GPS Translator for Trident Reentry Body
Accuracy Analysis - Michael H. Boehme
• Global Positioning System Translators for Precision Test and
Evaluation Thomas Thompson and Edwin E. Westerfield

12. Thank You
Queries